Directory

718 CE

A year defined by the failure of the Arab siege of Constantinople, a turning point that preserved the Byzantine Empire and halted Muslim expansion into southeastern Europe.

Conflict & Security

  • The massive Arab siege of Constantinople, which had begun in 717, ended in failure as the combined Byzantine defenses, including Greek fire, the city's formidable walls, and a harsh winter, devastated the besieging forces.
  • The Byzantine Emperor Leo III the Isaurian successfully coordinated the defense of the capital, employing naval warfare with Greek fire to destroy much of the Umayyad fleet.
  • The Bulgars under Khan Tervel attacked the Arab forces from the rear, inflicting heavy casualties and contributing to the lifting of the siege.

Geopolitics & Diplomacy

  • The failure of the siege was one of the most significant military events of the early medieval period, preventing Muslim conquest of Constantinople and preserving the Byzantine Empire for another seven centuries.
  • The Umayyad Caliphate suffered enormous losses in men and ships, marking the effective end of Arab attempts to conquer Constantinople by direct assault.

Climate & Environment

  • Atmospheric carbon dioxide concentration was approximately 277 parts per million, as later confirmed by ice core analysis.

Culture & Society

  • The estimated world population was approximately 222 million.